Integrating with my webiste

I am currently redoing my website and would like to integrate my wordpress blog into it. I have a basic level of HTML/CSS and am creating the site myself in dreamweaver. I have looked around but am really struggling to find any descriptions that clearly explain what I need to do. Can I do this in wordpress.com? If not, do I need to export to a different blog provider? Do I need to redirect my blog and customise the CSS layout to match my site? If I do this will each individual blog be linked to my domain or to wordpress?

You can't do it WITHIN WordPress.com. What you can do is either use the RSS feed of your WP.com site to pull in the content to a designated page on your website OR you can use an iframe, although that is very old-fashioned and clunky-looking. In either case I'm afraid you're on your own with this: it's an external website issue, not a WordPress.com issue.